Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb46881a18a1fb2…

MALICIOUS

PDF

33.0 KB Created: 2021-07-04 16:41:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 89fbbc95e746258bfdceaa8c330760a7 SHA-1: d78c43ee6749b5cb46f0bca68e378a033ff291f7 SHA-256: aeb46881a18a1fb2d6122463c671543bc0d4531ceffda37aaf6c713375ed470a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/431946152/roblox-cheat-game-hack PDF link annotation
    • http://foo.com.tw/files/how-to-hack-games-in-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-become-a-speed-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-coins-in-roblox-bandit-siimuator_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-2021pc_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-phantom-forces-money-hack-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-free-draw_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-no-siging-i-n_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/robux-hack-no-download-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-games-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/royal-high-school-roblox-how-to-get-free-money_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-cars-in-mad-city-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-generator-no-scams_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C1A 21852 bytes
SHA-256: 8afc040d2590031bdfec5a72dd8d5c8884edf8aba84e6467392897cbd2c05fc2
font_01_sfnt_off00005c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C75 18756 bytes
SHA-256: 7a1367f9845b78f18e7acfba61726040fc30bed5fcfaea3e23da2d5e07670f1c

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